Problem 81

The change in temperature of air =    

The specific heat capacity of air =  .

The volume occupied by one mole of air=  .

The volume of air =  

Step 1.

 The number of moles of methane gas required in the system is calculated by the formula,

     

 

we have to convert volume into liter

 

So, the conversion of volume from   into liter is 

 

 

The number of moles of air is calculated by dividing the volume of air by the volume occupied by one mole of gas.

 

    Moles of air=  

 

The balanced chemical equation for the combustion of methane is,

   

The enthalpy change of the given reaction is calculated by the formula,

 

 

Substitute the values o, , and in equation then,

 

=